AUTHENTICITY DETERMINATION METHOD USING COLOR SHIFT MATERIAL AND COLOR SHIFT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide an authenticity determination method using a color shift material having high eye catch effects using a difference of color development principles between the reproduction color of a subtractive color mixture layer and the reproduction color of an additive color mixture layer by laminating the subtractive color mixture layer and the additive color mixture layer.SOLUTION: There is provided an authenticity determination method using a color shift material having a subtractive color mixture layer for developing a reproduction color by subtractive color mixture and an additive color mixture layer formed in at least a part of the subtractive color mixture layer for developing the reproduction color by additive color mixture in which the reproduction color of the additive color mixture layer is developed only at a specific observation angle. When the color shift material is visualized from two or more different observation angles, the reproduction color of the additive color mixture layer is visualized at the specific observation angle, and the reproduction color of the subtractive color mixture layer is visualized at any angle other than the specific observation angle. In this case, an authentication determination object is determined to be authentic.